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

To make the frame triangles, 6 frame vertices, 2 bar clamps and 6 threaded bolts are needed.

Frame Vertex part
Bar Clamp part

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

(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)

Z Drive System

Z-Axis Motor Mounts

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)

Z-Bar assembly

Parts

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

Assembly

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

Tips

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 Motor Mounts

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)

X-Axis Vertical Bearing

See Mendel X-Axis for further information.

Parts

Total # of assemblies: 1

Name Qty/assembly Total Qty Type
z-flag.par 1 1 Thin sheet
x-axis-side-plate-nut-jig_2off 1 1 RP
x-bar-clamp-m4_4off 2 2 RP
x-vert-drive-nut-trap_4off 2 2 RP
x-vert-drive-side-plate-180-end_2off 2 2 RP
m4-nut 4 4 Fastener
m4-nylock 4 4 Fastener
m4-washer 16 16 Fastener
m4x40-cap 8 8 Fastener
m8-nut 1 1 Fastener
Reprapped parts

X-vert-bearing-180-printed-parts.PNG

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

(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)

Connecting the X-Axis to the Z-Axis

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)

Z and X axes Endstops

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)

OpenY Axis

Y-axis Guide Bars

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)

OpenY 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)

Print Bed

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

(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

(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)

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

(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.

Soldering Tip

It is better to solder from the center of the mother board to the edge. If you solder the pins on the edge first, they will make it difficult to solder the pins in the center.

Top pins

Solder 1 1x6, 6 1x4, and 7 2x3 pin headers on top of the board. The long post should be standing up to take a connector.

Solder one leg on each one to tack them into place. Then re-heat the joint and push on the component until it is perfectly situated.

Then you'll want to solder the rest of the leads. You will get burnt if you touch the other side of the pin you are soldering.

Driver sockets

Place the female headers for the stepper drivers on top of the board.

You can use the 1x8 and 1x6 pin headers to jig them straight. Turn the board over and solder these pins.

D1, D2 - Diodes

These must be placed in the proper orientation. The band on the diode must be turned the same way as the mark on the board.

Definitely solder D2 in. D2, F1, and F2 are shown installed here.

D1 should only be installed if the 5A rail is powered by 12V. It can be omitted and the Arduino will be powered from USB.

You will want D1 installed if you add components to print without a PC.

To reiterate, D1 MUST be omitted if you are powering the 5A rail by more than 12V, or the power is not absolutely clean, otherwise you may damage your ramps.

Motor drivers

End Stops

Hot tip

RAMBO

Motherboard

Motor drivers

End Stops

Hot tip