01. Tools

Step 1

No power tools

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• Do not use power tools for the whole assembly or you might damage hardware. Always use hand tools.
• Tightening torque values recommended:
• Max 4.5Nm for M5 screws on metal to metal assemblies (e.g. joining plate on an extrusion).
• Max 1.5-2Nm for M5 screws on printed part to metal (e.g. y_rod_holder.stl on extrusion).

Step 2

Mandatory tools

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• This step and the next one list the mandatory tools you need to build the Bear frame.
• Small pliers with cutting capabilities
• Hex key 1.5mm for MK2(S) and MK2.5(S) only, not useful for MK3(S).
• Hex key 2mm.
• Hex key 2.5mm. Ball end would be very useful.
• Hex key 3mm.
• Spanner 5.5mm
• Slotted screwdriver #1

Step 3

Mandatory tools

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• This step and the previous one list the mandatory tools you need to build the Bear frame.
• Having a quality square will help you to build the Bear precisely. We recommend a 200mm long machinist precision square, ideally with standard DIN 875 / BS 939 (any grade).
• If you don't have such a square or want to use a lower quality one, check these videos on how to test and fix your square:
• How to Square a Square by Wesley Treat: https://youtu.be/FNpAQHrNpNU
• How to Square a Square and Make it True by Wood By Wright: https://youtu.be/enEYzTXg2Jg
• Caliper, 150mm long minimum. If you don't have a caliper you can use a steel ruler. (A vernier caliper is generally more accurate than a digital caliper, at the same price point.)

Step 4

Optional tools

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• This step and the next one list the optional tools that can be helpful during assembly. You can build the Bear frame perfectly without them.
• Sorry for this extra list, we love tools...
• A long caliper of 200mm or more helps to align the Y axis smooth rods spacing on any "Prusa type" printer.
• A general purpose clamp will facilitate the squaring of the frame when using a machinist square.
• Tweezers are always useful :)
• You can add a dab of blue Loctite #243 to the screws during assembly to prevent them from unscrewing.
• An 8mm drill bit or 8mm reamer can be useful in case the smooth rods holes on Z axis are a bit too tight.

Step 5

Optional tools

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• This step and the previous one list the optional tools that can be helpful during assembly. You can build the Bear frame perfectly without them.
• Files and deburring tool can be helpful to clean the printed parts.
• It is good practice to re-grease the bearings during the assembly.
• We recommend the use off a lithium based lubricant that has a viscosity between 50 and 100mm2/s at 40 °C, NLGI class 2 and a thermal resistance of 100°C or more.
• A torque tool can be useful to ensure you apply max torque without damaging hardware.
• We recommend max 4.5Nm for the metal to metal assemblies (e.g. joining plate on an extrusion) and max 1.5-2Nm for printed parts (e.g. y_rod_holder.stl on extrusion).

Step 6

Optional parts

No step image supplied by iFixit.

• Before starting to disassemble your printer, did you see we have a list of optional parts for the Bear frame?
• Official optional parts
• Community's optional parts

Step 7

Next chapter

No step image supplied by iFixit.

• Congratulations you have finished this chapter and are ready to start with the disassembly :-)
• Got to the next chapter: 02. Preflight check and disassembly