Open Hybrid Mendel
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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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Overview
The Open Hybrid Mendel (or OHM) is a project of the Penn State Reprap User Group. It is a Mendel at heart,using both standard Sells Mendel parts in addition to a Prusa Z drive, as well as a number of improvements from our class and the community at large. It is so named due to this hybridization of designs, and obtains the 'Open' designation from the OpenX and OpenY axes. The Prototype for the OHM is Etherdais_Unit_One
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 (add thing), 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.
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 smoothe 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
Quantity | File-Name | Comments | Diagram |
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4 | bed-spring_4off | ||
6 | Camiel_frame_vertex_7off | Alternative part by Camiel | |
2 | z-prusa-motor-mount | ||
2 | prusa_bar-clamp_2off | ||
2 | Pla_coupling_nophead | 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 | ||
4 | Y-bar-clamp_4off | ||
1 | Y-idler-bracket_1off | ||
1 | Y-motor-bracket_1off_mod3-15 | Modified by PSU Reprap Collective | |
2 | Z-bar-top-clamp_2off | ||
2 | Z_leadscrew_base_with_apron_mod_3-19 | Modified by PSU Reprap Collective | |
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 | ||
1 | OpenX_Carriage | Open X by Buback | |
1 | OpenX_Undercarriage_Bracket | Open X by Buback | |
1 | OpenX_Arm | 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 | Open Y by Buback | |
1 | Arm_210 | Open Y by Buback | |
1 | OpenY_Undercarriage_Bracket | Open Y by Buback | |
3 | Electronics_board_mount | Created by RUG member SethG | |
2 | X-axis-side-plate-nut-jig_2off | ||
2 | Z-leadscrew-base-bar-clamp_2off | ||
4 | modified endstop holder | Prusa opto holder modified to have a thicker end | No picture yet |