Open Hybrid Mendel
This page is a development stub. Please enhance this page by adding information, cad files, nice big images, and well structured data!
Release status: Working
Description | A hybrid between Prusa and Mendel models using several improved pieces from the community
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License | GPL
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Contents
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 |
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6 | camiel_frame_vertex_6off | Alternative part by Camiel | |
2 | z-prusa-motor-mount_2off | ||
2 | z-bar-top-clamp_2off | ||
4 | prusa_bar-clamp_2off |
Quantity | File-Name | Comments | Diagram |
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4 | bed-spring_4off | ||
4 | pla_coupling_nophead-1piece_4off.STL | Alternative part by Nophead | |
2 | x-180-z-bearing-plate_2off | ||
2 | x-360-z-bearing-plate_2off | ||
2 | x-360-z-bearing-plate-mirror_2off | ||
1 | xaxis-motor-bracket_1off | Alternative part by Rhys-jones | |
6 | x-bar-clamp-m3_6off | ||
4 | x-bar-clamp-m4_4off | ||
1 | x-end-bracket_1off | ||
4 | x-vert-drive-nut-trap_4off | ||
2 | x-vert-drive-side-plate-180-end_2off | ||
2 | x-vert-drive-side-plate-360-end_2off_rebuild | ||
8 | y-bar-clamp_8off | ||
1 | y-idler-bracket_1off | ||
1 | y-motor-bracket_1off_mod3-15 | Modified by PSU Reprap Collective | |
1 | OpenX_Carriage_1off | Open X by Buback | |
1 | OpenX_Undercarriage_Bracket_1off | Open X by Buback | |
1 | OpenX_Arm_1off | Open X by Buback | |
1 | 8mm_Belt_Harness_1off | Open Y by Buback, modified by PSU Reprap Collective | |
2 | 8mm_Crossbar_Mount_2off | Open Y by Buback | |
2 | Arm_90-180_2off | Open Y by Buback | |
1 | Arm_210_1off | Open Y by Buback | |
1 | OpenY_Undercarriage_Bracket_1off | Open Y by Buback | |
3 | electronics_board_mount_opt | Created by RUG member SethG | |
2 | x-axis-side-plate-nut-jig_2off | ||
2 | z-leadscrew-base-bar-clamp_2off | ||
2-5 | prusa_modified_endstop_holder_2-5off | Prusa opto holder modified to have a thicker end | No picture yet |
Extruder
Currently not included in STL zipfile
Quantity | File-Name | Comments | Diagram |
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1 | HerringboneDrivenGear | Alternative part by Rhys-jones | |
1 | HerringboneDriveGear | Alternative part by Rhys-jones | |
1 | Gregs_accessible_wades_v6 | Alternative extruder by Greg-Frost | |
1 | Gregs_accessible_wades_idler |