Ohm/How to build an OHM

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Contents

Introduction

The Open Hybrid Mendel (OHM) has several advantages over the generic Mendel model. Mainly, it is more flexible. The extruder carriage and printing board are designed to easily pop off the machine without unscrewing any parts.

All STL files mentioned in this article are referring to, and can be downloaded from the OHM Parts section.

Mechanical Construction

Frame

Frame Triangles

Parts

Total # of assemblies: 2

Name Qty/assembly Total Qty Type
Camiel_frame_vertex_6off 3 6 RP
prusa_bar-clamp_4off 1 2 RP
m8-nut 14 28 Fastener
m8-washer 14 28 Fastener
m8-threaded rod D 3 6 Threaded Rod
Reprapped parts

Assembly

(Assembly guide. Delete this note when section is finished)

Tips

When you assemble the frame triangles, it will be easier if you assemble the two top vertices the last. To insert the rod into the vertices, you can tie two nuts tight together and then use a wrench to screw in the rod.

Connecting the Triangles

Parts

Total # of assemblies: 1

Name Qty/assembly Total Qty Type
y-motor-bracket_1off_mod3-15 1 1 RP
y-idler-bracket_1off 1 1 RP
m4x40-cap 4 4 Fastener
m4-washer 12 12 Fastener
m4-large OD washer 8 8 Fastener
m4-nut 4 4 Fastener
m8-nut 46 46 Fastener
m8-washer 46 46 Fastener
m8-threaded rod E 4 4 Threaded Rod
m8-threaded rod F 3 3 Threaded Rod
Reprapped parts

Assembly

It is a good idea to assemble the pulley bearings before putting the motor mount and idler on (Assembly guide. Delete this note when section is finished)

Tips

It is easier to assemble the triangles, if connected both ends first, and then connect the bottom two rods.(Extra tips to help assemble. Delete this note when section is finished)

Z Drive System

Z-Axis Motor Mounts

Parts

Total # of assemblies: 2

Name Qty/assembly Total Qty Type
z-prusa-motor-mount_2off 1 2 RP
z-bar-top-clamp_2off 1 2 RP
m3x20-cap 4 8 Fastener
m3-washer 4 8 Fastener
m8-nut 2 4 Fastener
m8-washer 4 8 Fastener
Stepper Motor 1 2 Motor
Reprapped parts

Assembly

Leave the smooth rod clamps loose and save the threaded rod for "connecting the x and z axis" section, since the x assembly needs to slide on before these are attached. (Assembly guide. Delete this note when section is finished)

Tips

(Extra tips to help assemble. Delete this note when section is finished)

Assembly of Z-axis can be started from sticking everything together in one rod. Settling all the parts (including the two top vertices for the frame triangle) on Z axis and connecting them with rod at one side, then insert the rod for the other side.

X-Z Assembly

X-Axis Idler Bracket

Parts

Total # of assemblies: 1

Name Qty/assembly Total Qty Type
x-end-bracket_1off 1 1 RP
x-180-z-bearing-plate_2off 2 2 RP
x-bar-clamp-m3_4off 2 2 RP
m3x20-cap 4 4 Fastener
m3-nylock 4 4 Fastener
m3-washer 8 8 Fastener
m4x16-cap 2 2 Fastener
m4x40-cap 6 6 Fastener
m4-nylock 8 8 Fastener
m4-washer 22 22 Fastener
m4-large OD washer 4 4 Fastener
bearing-4x13x5 6 6 Bearing
Reprapped parts

Assembly

(Assembly guide. Delete this note when section is finished)

Tips

(Extra tips to help assemble. Delete this note when section is finished)

X-Axis Motor Mount

Parts

Total # of assemblies: 1

Name Qty/assembly Total Qty Type
xaxis-motor-bracket_1off 1 1 RP
PSU_x_vert_sideplate_360_end_2off 2 2 RP
x-bar-clamp-m3_4off 2 2 RP
x-360-z-bearing-plate_2off 2 2 RP
x-360-z-bearing-plate-mirror_2off 2 2 RP
pulley_w-set_screw_2off 1 1 RP
m3x20-cap 8 8 Fastener
m3-nylock 4 4 Fastener
m3-washer 12 12 Fastener
m4x16-cap 6 6 Fastener
m4x40-cap 4 4 Fastener
m4-nylock 10 10 Fastener
m4-washer 28 28 Fastener
m4-large OD washer 4 4 Fastener
bearing-4x13x5 8 8 Bearing
Stepper Motor 1 1 Motor
Reprapped parts

Assembly

(Assembly guide. Delete this note when section is finished)

Tips

(Extra tips to help assemble. Delete this note when section is finished)

X-Axis Vertical Bearing

See Mendel X-Axis for further information.

Parts

Total # of assemblies: 2

Name Qty/assembly Total Qty Type
x-axis-side-plate-nut-jig_2off 1 2 RP
x-bar-clamp-m4_4off 2 4 RP
x-vert-drive-nut-trap_4off 2 4 RP
x-vert-drive-side-plate_4off 2 4 RP
m4-nut 4 8 Fastener
m4-nylock 4 8 Fastener
m4-washer 16 32 Fastener
m4x40-cap 8 16 Fastener
m8-nut 1 2 Fastener
Reprapped parts

Assembly

First, assemble the x-vert-drive-nut-trap_4off. To do this, you need a lighter, four m4 nuts and a m4x40-cap. Place an m4 Nut on the end of the m4x40-cap and heat with the lighter. Caution: Do not heat for too long or the m4x40-cap will become very hot.

Push the heated nut into one of the hexagonal holes in the x-vert-drive-nut-trap_4off. Repeat for all four nuts.

Screw x-vert-drive-side-plate-180-end_2off and x-bar-clamp-m4_4offtogether using m4x40-cap and washers. Do not screw them all the way in.

Screw x-vert-drive-nut-trap_4off into x-vert-drive-side-plate-180-end_2off using a diagonal pattern. Remember to use washers. Do not screw them all the way in.

Repeat previous steps to create other half. Make sure that you place the screws diagonally in a way that they do not interact with the other screws.

Place the x-vert-drive-nut-trap_4off in between the bottom half of the two sides and line up screws. Screw in the M4 screws until they sit in the nuts and are firmly in place. This could take some adjustment.

Place an M8 nut in between the two trap sides. Then screw the upper screw together. Tighten all screws in steps.

Tips

  • In some cases, though it is not necessary, it may help if you drill out the holes before assembling.
  • To help align the screw holes, place on screw in, clamp the parts, and drill the rest of the holes.

Assembling the X-Axis

Parts

Total # of assemblies: 1

Name Qty/assembly Total Qty Type
m8-smooth rod A 2 2 Smooth Rod

Assembly

(Assembly guide. Delete this note when section is finished)

Tips

(Extra tips to help assemble. Delete this note when section is finished)

Connecting the X-Axis to the Z-Axis

Parts

Total # of assemblies: 2

Name Qty/assembly Total Qty Type
pla_coupling_nophead-1piece_4off 2 4 RP
prusa_bar-clamp_4off 1 2 RP
m3x25-cap 4 8 Fastener
m3-nylock 4 8 Fastener
m3-washer 8 16 Fastener
m8-nut 2 4 Fastener
m8-washer 2 4 Fastener
m8-threaded rod G 1 2 Threaded Rod
m8-smooth rod B 1 2 Smooth Rod
Reprapped parts

Assembly

(Assembly guide. Delete this note when section is finished)

Tips

(Extra tips to help assemble. Delete this note when section is finished)

Z and X axes Endstops

Parts

Total # of assemblies: 2

Name Qty/assembly Total Qty Type
endstop-holder_microsw-1_small enstops_3off 1 2 RP
m4x20-cap 1 2 Fastener
m4-nylock 1 2 Fastener
m4-washer 2 4 Fastener
Reprapped parts

Assembly

(Assembly guide. Delete this note when section is finished)

Tips

(Extra tips to help assemble. Delete this note when section is finished)

OpenY Axis

Y-axis Guide Bars

Parts

Total # of assemblies: 2

Name Qty/assembly Total Qty Type
y-bar-clamp_8off 4 8 RP
m4x40-cap 4 8 Fastener
m4-nylock 4 2 Fastener
m4-washer 8 16 Fastener
m8-smooth rod C 1 2 Smooth Rod
Reprapped parts

Assembly

(Assembly guide. Delete this note when section is finished)

Tips

(Extra tips to help assemble. Delete this note when section is finished)

OpenY Assembly

Parts

Total # of assemblies: 1

Name Qty/assembly Total Qty Type
OpenY_Arm 90 - 180_2off 2 2 RP
OpenY_arm45 1 1 RP
OpenY_8mm Crossbar Mount_2off 2 2 RP
OpenY_8mm Belt Harness_1off 1 1 RP
OpenXY_bracket 2 2 RP
m4x20-cap 12 12 Fastener
m4x40-cap 4 4 Fastener
m4-nylock 8 8 Fastener
m4-washer 26 26 Fastener
m8-nut 4 4 Fastener
m8-washer 2 2 Fastener
m8-threaded rod H 1 1 Threaded Rod
bearing-4x13x5 12 12 Bearing
Reprapped parts

Assembly

(Assembly guide. Delete this note when section is finished)

Tips

(Extra tips to help assemble. Delete this note when section is finished)

Print Bed

Parts

Total # of assemblies: 1

Name Qty/assembly Total Qty Type
bed-spring_4off 4 4 RP
m4x40-cap 4 4 Fastener
m4-washer 4 4 Fastener
Reprapped parts

(Parts needed for assembly. Delete this note when section is finished)

Assembly

(Assembly guide. Delete this note when section is finished)

Tips

(Extra tips to help assemble. Delete this note when section is finished)

Motors, Belts and Endstops

Parts

Total # of assemblies: 1

Name Qty/assembly Total Qty Type
pulley_w-set_screw_2off 1 1 RP
endstop-holder_microsw-1_small enstops_3off 1 1 RP
m2-5 set screw? 1 1 Fastener
m3x25-cap 4 4 Fastener
m3-washer 4 4 Fastener
Stepper Motor 1 1 Motor
Reprapped parts

(Parts needed for assembly. Delete this note when section is finished)

Assembly

(Assembly guide. Delete this note when section is finished)

Tips

(Extra tips to help assemble. Delete this note when section is finished)

Extruder

Carriage

Parts

Total # of assemblies: 1

Name Qty/assembly Total Qty Type
OpenX_Carriage_1off 1 1 RP
OpenX_arm_PSU_1off 1 1 RP
OpenXY_bracket 2 2 RP
m4x20-cap 14 14 Fastener
m4-nylock 14 14 Fastener
m4-washer 36 36 Fastener
bearing-4x13x5 10 10 Bearing
Reprapped parts

Assembly

(Assembly guide. Delete this note when section is finished)

Tips

(Extra tips to help assemble. Delete this note when section is finished)

Motor Mount

Parts

(Parts needed for assembly. Delete this note when section is finished)

Assembly

(Assembly guide. Delete this note when section is finished) This unfinished part includes the main driven gear, idler and lastly the main section.

Tips

(Extra tips to help assemble. Delete this note when section is finished)

Hot Tip + Electronics

Parts

(Parts needed for assembly. Delete this note when section is finished)

Assembly

(Assembly guide. Delete this note when section is finished)

Tips

When you feel like the tip is stuck, heat it up, and then use another piece of filament to quickly suck out the part that were stuck in the tip. (Extra tips to help assemble. Delete this note when section is finished)

Spool

Spool Assembly

Parts

(Parts needed for assembly. Delete this note when section is finished)

Assembly

(Assembly guide. Delete this note when section is finished)

Tips

(Extra tips to help assemble. Delete this note when section is finished)

Spool Mount

Parts

(Parts needed for assembly. Delete this note when section is finished)

Assembly

(Assembly guide. Delete this note when section is finished)

Tips

(Extra tips to help assemble. Delete this note when section is finished)

Electrical Construction

RAMPS

Motherboard

RAMPS 1.4 is used as our mother board.

Connecting Power

Connecting the Motors

Connecting the End Stops

Connecting the Hot Tip

Connecting the Thermocouple

RAMBO

Motherboard

Motor drivers

End Stops

Hot tip