Rostock Build Manual

Rostock Documentation

Assembly

Connect the 3 stepper motors to the X, Y, Z driver outputs on the RAMPS board.
Maybe add short pieces of colored shrink wrap to identify the motor and endstop cables.
- Red = X: front left motor and endstops (electronics side).
- Yellow = Y: front right motor and endstops (plywood frame side).
- Blue = Z: back middle motor and endstops.
Adjust the motor voltage (small round potentiometers) on the stepper drivers to 9 o'clock (roughly 30%). This will allow the motors to skip steps in case the endstops don't work. When calibration is done, 10 or 11 o'clock is a good setting to prevent skipping but also avoid overheating the motors and drivers.
Grabercars says: about 1/8 of a turn clockwise off of minimum power on the Pololu is all it takes to get the motors operating correctly and not making any noise.

Connect the 3 top endstop wires to the XMAX, YMAX, ZMAX connectors on the RAMPS board.
The endstops are configured "normally connected", so the circuit should be interrupted when the endstop is hit. If your endstops are "normally open", change X_ENDSTOPS_INVERTING to true in Configuration.h.

It can be challenging to get good belt tension. You should be able to pluck nice bass tones on the belts. Here is Johann's tensioning method:

Make sure you don't have a flange on the outer idler bearing (the one that is facing you).
Put timing belt on motor pulley and idler bearings.
Push idler end up as far as possible with one hand.
Remove belt from idler bearings.
Push idler end up 3 mm more and tighten screws on smooth rod.
Put timing belt on idler again. It will be very tight.
The idler bearings are tilted 2 degrees upwards, so your belt should not fall off even though the outer bearing has no flange.
If the belt does fall off, reduce belt tension slightly, or print a new idler end with increased upward tilt.