Sample BOM for a Big T-Slot Adapto

This bill of materials is for a pretty big Adapto with a 310x220x270mm (18.4L) print volume that uses T-slot extrusions for its frame. The Adapto is a very flexible design that can easily be adapted to your need. Details on how to do that are discussed in some of the "Comment" fields and below the actual BOM.

Note: this BOM is a work in progress and still needs to be verified. Use it, but use it with care!

The Sample Source field aims to give one or several sample shop links for each item. It is currently biased towards Europe and especially Germany since that's where the initial BOM author lives. Feel free add additional suitable sources if you know them! For little hardware items that are required in small quanitites (screws used in the extruder etc.) it's often most cost-efficient to get them in a local hardware store. If larger quantities are required, it's often cheaper to order a bag of e.g. 50 screws online even if you won't need all of them (the rest may still be useful for further projects).

Quantity	Part Name	Part Type	Used Where	Comment	Sample Source
5	NEMA 17 stepper motor	Electronics	Axes, extruder	1.5A or less, 8mH inductance or less, 44Ncm (4.4kg.cm) or more of torque, 1.8 or 0.9 degrees per step (200/400 steps/rev respectively), ca. 47mm long.	[1] (US/UK)
1	J-Head hotend	Electronics		Preferably with 0.5mm nozzle, for 3mm filament. Includes thermistor and resistor. Alternatives: e.g. Makergear or Budaschnozzle.	[2]
1	Aluminum hotend mounting plate	Electronics		Needed if you use the J-Head hotend	[3]
1	Silicone or kapton heater, 300x200mm, suitable for 24V	Electronics		Must be able to reach 100 °C above room temperature when run from 24V	[4] (UK), [5] (DE)
1	RAMBo electronics	Electronics		Alternatives: e.g. 4pi, RAMPS, Sanguinololu	[6] (US/UK)
1	SDRAMPS Add-on	Electronics		Optional add-on for RAMBo/RAMPS, allows printing without a computer connected	[7] (US/UK)
1	MicroSD Card, 2 GB or more, with SD adapter	Electronics		Optional, for use with SDRAMPS	[8] (UK), [9] (DE)
1	100k thermistor	Electronics		To measure the heatbed temperature	[10] (US/UK)
1	24V 15A Power Supply	Electronics		12V 20A is a more conventional choice and sufficient for a regular-sized printbed (200x200mm), but for a large printbed more power seems desirable.	[11] (CN), [12] (CN/de)
1	Device connection cable, 3 1.5mm² wires, mains plug at other end, length 1.5m or as desired	Electronics		Get one that fits your type of mains sockets	[13] (UK), [14] (DE)
1	Switchable socket outlet	Electronics		Get one that fits your type of mains sockets. This is the easiest solution, you can also wire a switch between the PSU and mount it to the printer frame.	[15] (UK), [16] (DE)
1	Speaker cable, 2 x 2.5mm², length ca. 1m	Electronics		To connect PSU to RAMBo	[17] (DE)
4	Heatshrink, ca. 2.5mm dia	Electronics		To insolate thermistor wires
1	Kapton tape, ca. 6mm wide	Electronics			[18]
4	20x20mm T-slot extrusion, aluminum, 360mm long	Extrusions	Bottom frame
3	20x20mm T-slot extrusion, aluminum, 420mm long	Extrusions	Top frame
1	T-Slot nuts, bag of 50+	Extrusions	Frame
1	Post-install T-Slot nuts, bag of 20	Extrusions	Frame	You don't strictly need those, but they are extremely useful for mounting additional stuff to the frame after initial assembly
4	M8x30mm bolt	Hardware	Idlers
4	M8 nut	Hardware	Z axis	Do not use zinc-coated, either plain steel or stainless is fine	[19] (DE)
1	M8 washers, bag of 20+	Hardware	Idlers, extruder		[20] (DE)
2	M8 nyloc nut	Hardware	Extruder		[21] (DE)
1	M5x10mm socket head cap screws, bag of 50+	Hardware	Frame assembly etc.	Take care of your extrusion type – some require M4 screws instead of M5 (then you'll need some of both)	[22] (DE)
1	M5x20mm socket head cap screws, bag of 20+	Hardware			[23] (DE)
1	M5 washers, bag of 50+	Hardware			[24] (DE)
1	M5 nuts, bag of 50+	Hardware		Thin nuts preferred	[25] (DE)
2	M4x55mm socket head cap scew	Hardware	Extruder	Length can vary a bit; other head types are OK as well	[26] (DE)
2	M4 nut	Hardware	Extruder		[27] (DE)
1	M3x10mm socket head cap screws, bag of 50+	Hardware	Motor mounts, extruder etc.		[28] (DE)
1	M3x20mm socket head cap screws, bag of 10+	Hardware	Print table etc.		[29] (DE)
1	M3x35mm socket head cap screw	Hardware	Extruder
1	M3x10mm grub screw	Hardware	Extruder	Used in small gear
1	M3 washers, bag of 50+	Hardware			[30] (DE)
1	8mm hobbed bolt (ca. 60mm long)	Hardware	Extruder		[31] (US/UK)
2	Spring, ca. 8mm OD (outer dia.), ca. 16mm long	Hardware	Extruder
6	Binder clips, 19mm wide	Hardware	Print table		[32] (UK), [33] (DE)
1	Zip ties, bag of 50+, 100mm long (or shorter)	Hardware		To secure wires	[34] (UK), [35] (DE)
1	Zip ties, bag of 20+, at least 140mm long	Hardware		To secure wires to the frame	[36] (DE)
1	PVC aquarium tubing, OD 6mm, ID 4mm	Hardware	Z axis	Typically sold in pieces of 1m or longer (though you won't need more than ca. 2x 16mm or so)	[37] (DE)
7	608ZZ Bearing	Mechanical	Idlers, extruder		[38] (US/UK)
10	LM8UU Bushing	Mechanical	Axes		[39] (CN), [40] (DE)
2	GT2 Belt, 6mm wide, at least 900mm long	Mechanical	X & Y axis	Alternative: T2.5 belts and pulleys	[41] (US/UK)
2	GT2 Pulley	Mechanical	X & Y axis		[42] (US/UK)
4	8mm Drill Rod, 435mm long	Mechanical	X & Z axis	Called "Silver Steel" in some parts of the world; type O1 or W1 works fine and is usually cheapest. Plain steel rods from a hardware store are not recommended; zinc-coated rods are not suitable.
2	8mm Drill Rod, 400mm long	Mechanical	Y axis
2	5mm Threaded rod, 400mm long	Mechanical	Z axis	Plain steel or stainless will work, but stainless is recommended. Do not use zinc-coated rod, as the zinc can lead to binding.
1	Glass plate 310x220x2mm	Mechanical	Print table	Top-most part of print table. Don't try to order glass online; better ask in some local glazier's shops to get a custom-cut piece of the desired size.
2	Aluminum sheet, 310x235x1.5mm	Mechanical	Print table	Middle and lower part of print table. Upper one serves as heat spreader, the flexible heater is taped below it. 15mm deeper than the glass plate to leave place for M3 screws.	[43] (DE/Berlin)
1	M8x20mm grub screw or threaded rod	Mechanical	Extruder
1	alt_RP_Parts_For_20X20_Alu_Special/ Y_Idler_1_Off.stl	RP
1	alt_RP_Parts_For_20X20_Alu_Special/ Y_Motor_Mount_1_Off.stl	RP
1	Some_Small_Plates/ Foot_X_4.stl	RP
1	Some_Small_Plates/ Y_Rod_Clamp_X_4.stl	RP
1	Some_Small_Plates/ Z_Rod_Holders_All.stl	RP
6	90_Corner_Inner_6_Off.stl	RP
1	Extruder_Idler_1_Off.stl	RP
1	Extruder_X_Carriage_Combo_1_Off.stl	RP
1	Large_Gear_T36_1_Off.stl	RP
1	Small_Gear_T13_1_Off.stl	RP
2	X_Bar_Clamp_2_Off.stl	RP
4	X_End_Z_Bearing_C_Clamp_4_Off.stl	RP
1	X_Idler_1_Off.stl	RP
1	X_Motor_Mount_1_Off.stl	RP
3	Y_Bearing_Holder_LM8UU_3_Off.stl	RP
1	Y_Belt_Block_1_Off.stl	RP
2	Z_Motor_Holder_2_Off.stl	RP

Note: the RPs (reprapped parts) can be found in the Github repository in the RP_Parts/STLs directory.

Additional comments

RAMBo electronics

RAMBo packages usually already include 3 mechanical endstop switches, 3 cables with 2x2.54mm plugs for the endstops, wires for 2 thermistors, 4 terminal plugs for the motor cables, and an USB A/B Cable. If your electronics kit doesn't include them, you'll need to get them separately.

Power Supply

If you run everything from 24V, you must take care that electronics, hotend etc. can handle it! RAMBo and 4pi accept 24V; RAMPS does too, but you MUST remove the diode that feeds the Arduino or it will be grilled!

Size calculations

The Adapto requires 7 T-slot extrusions:

• 2 in X direction that form the front and the back of the lower frame ("X extrusion" or Xe)
• 2 in Y direction that form the left and right sides of the lower frame ("Y extrusion" or Ye)
• 2 in Z direction that form the vertical part of the upper frame ("Z extrusion" or Ze)
• 1 that forms the top part of the upper frame ("top extrusion" or Te)

Relations between extrusion lengths:

• The Z extrusion should be 60mm longer than the X extrusions to exactly fit the printed parts

For the sample BOM above:

• Xe = Ye = 360
• Ze = Te = 420

Lower frame size (assuming that the X extrusions cover the whole front/back and the Y extrusions are mounted between them):

• The width of the frame is equal to the length of the X extrusions: Xf = Xe
• The depth of the frame is 40mm more than the length of the Y extrusions: Yf = Ye + 40

For the sample BOM above:

• Xf = 360
• Yf = 400

Maximum outer dimensions of the printer:

• The X/Z assembly is ca. 145mm wider than the lower frame: Xo = Xf + 145
• The printer is 10mm deeper than the lower frame due due the thickness of printed parts around the frame: Yo = Yf + 10
• The printer is 100mm higher than the length of the Z extrusions: Zo = Ze + 100

For the sample BOM above:

• Xo = 505
• Yo = 410
• Zo = 520

The printer requires 6 smooth rods, 2 for each axis. Their length should be approximately:

• X rods: ca. 70mm longer than the X extrusions: Xs = Xe + 70mm
• Y rods: as long as the lower frame is deep: Ys = Yf
• Z rods: ca. 15mm longer than the Z extrusions: Zs = Ze + 15mm

For the sample BOM above, the chosen lengths are:

• Xs = 435 (rounded up a bit so the same rod length can be used for X and Z)
• Ys = 400
• Zs = 435

The printer requires 2 smooth rods for the Z axis. They should be approximately 20mm shorter than the Z extrusions: Zt = Ze - 20

For the sample BOM above:

• Zt = 400

The print volume is approximately: TODO Will follow...