Open Hybrid Mendel

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This page is a development stub. Please enhance this page by adding information, cad files, nice big images, and well structured data!

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Open Hybrid Mendel (OHM)

Release status: Working

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Description
A hybrid between Prusa and Mendel models using several improved pieces from the community
License
GPL
Author
Contributors
Based-on
Categories
CAD Models
External Link


Overview

The Open Hybrid Mendel (or OHM) is a project of the Penn State Reprap User Group. It is a Mendel design, which uses both standard Sells Mendel parts, a Prusa Z drive, various redesigns from the community at large, and a number of small design improvements developed in our PSU Reprap class, in the spirit of open source design (see the wiki page on closed innovation for a good comparison of methodologies ) It is so named due to this hybridization of designs, and obtains the 'Open' designation from the OpenX and OpenY axes it uses. The prototype for the OHM design was Etherdais_Unit_One

Expanding into the realm of the biological, the OHM is the basis for a Mendel-based PCR system, currently designated the RepRap Mullis.


Any Mendel can be broken down into 6 sub-systems, which are somewhat interchangable between designs:

Frame - The OHM uses Camiel's thin shelled Vertex design, maintaining vertices similar to the Sells design, but using less filament

Y-axis - The OHM uses a modified OpenY, with an optoless belt harness, and a second 90/180 arm in place of the 90/270 arm. This demands two additional bearings, but we find the result is more stable, while retaining the benefits of the OpenY. A modified Sells y-motor bracket is used, which avoids printing an unused endstop holder from the original Sells design. The original Sells y-bar clamps seem well suited for mounting y-axis opto-endstops.

Z-drive system - The OHM uses a Prusa, double motor design for driving the Z axis, avoiding the large prints and continuous belt of the Sells Z-drive design. We still use Sells bar clamps to clamp the smooth rod to the Z-motor mounts, as they are compatable, and look sharp together.

X-Z assembly - Currently, the OHM build uses a standard Sells X-Z assembly, as described here in Mendel_X-axis.

Carriage - The OpenX carriage is the design of choice currently. This, and the OpenY

Extruder - We are in the process of finding a design which is more compatable with the TechZone steel hot tips we've been using recently, though the current design is a hack of herringbone extruder gears, and GregFrost's hinged wades extruder.

Parts

Download Zip: File:OpenHybridMendel 0.1.zip

Frame Parts

Quantity File-Name Comments Diagram
6 camiel_frame_vertex_6off Alternative part by Camiel Camiel frame vertex 7off.JPG
2 z-prusa-motor-mount_2off Pm-z-motor.jpg
2 z-bar-top-clamp_2off Z-bar-top-clamp 2off.JPG
4 prusa_bar-clamp_2off Pm-bar-clamp.jpg
8 y-bar-clamp_8off Y-bar-clamp 4off.JPG
1 y-idler-bracket_1off Y-idler-bracket 1off.JPG
1 y-motor-bracket_1off_mod3-15 Modified by PSU Reprap Collective Y-motor-bracket 1off mod3-15.JPG

Y Carriage Parts

Quantity File-Name Comments Diagram
4 bed-spring_4off Bed-spring 4off.JPG
1 8mm_Belt_Harness_1off Open Y by Buback, modified by PSU Reprap Collective 8mm Belt Harness 1off.JPG
2 8mm_Crossbar_Mount_2off Open Y by Buback 8mm Crossbar Mount 2off.JPG
2 Arm_90-180_2off Open Y by Buback Arm 90 - 180.JPG
1 Arm_210_1off Open Y by Buback Arm 210.JPG
1 OpenY_Undercarriage_Bracket_1off Open Y by Buback OpenY Undercarriage Bracket.JPG

X Axis Parts

Quantity File-Name Comments Diagram
4 pla_coupling_nophead-1piece_4off.STL Alternative part by Nophead Pla coupling nophead.JPG
2 x-180-z-bearing-plate_2off X-180-z-bearing-plate 2off.JPG
2 x-360-z-bearing-plate_2off X-360-z-bearing-plate 2off.JPG
2 x-360-z-bearing-plate-mirror_2off X-360-z-bearing-plate-mirror 2off.JPG
1 xaxis-motor-bracket_1off Alternative part by Rhys-jones Xaxis-motor-bracket 1off.JPG
6 x-bar-clamp-m3_6off X-bar-clamp-m3 6off.JPG
4 x-bar-clamp-m4_4off X-bar-clamp-m4 4off.JPG
1 x-end-bracket_1off X-end-bracket 1off.JPG
4 x-vert-drive-nut-trap_4off X-vert-drive-nut-trap 4off.JPG
2 x-vert-drive-side-plate-180-end_2off X-vert-drive-side-plate-180-end 2off.JPG
2 x-vert-drive-side-plate-360-end_2off_rebuild X-vert-drive-side-plate-360-end 2off rebuild.JPG

X Carriage

Quantity File-Name Comments Diagram
1 OpenX_Carriage_1off Open X by Buback OpenX Carriage.JPG
1 OpenX_Undercarriage_Bracket_1off Open X by Buback OpenX Undercarriage Bracket.JPG
1 OpenX_Arm_1off Open X by Buback OpenX Arm.JPG
2 x-axis-side-plate-nut-jig_2off X-axis-side-plate-nut-jig 2off.JPG

Extruder

Currently not included in STL zipfile

Quantity File-Name Comments Diagram
1 HerringboneDrivenGear Alternative part by Rhys-jones HerringboneDrivenGear.JPG
1 HerringboneDriveGear Alternative part by Rhys-jones HerringboneDriveGear.JPG
1 Gregs_accessible_wades_v6 Alternative extruder by Greg-Frost Gregs accessible wades v6.JPG
1 Gregs_accessible_wades_idler Gregs accessible wades idler.JPG


Electronics Mounting

Quantity File-Name Comments Diagram
2-5 prusa_modified_endstop_holder_2-5off Prusa opto holder modified to have a thicker end No picture yet
3 electronics_board_mount_opt Created by RUG member SethG. Optional Electronics board mount.JPG