01. Tools

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).

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

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).

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.)

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.

Files and deburring tool can be helpful to clean the printed parts.

It is good practice to re-grease the bearings during the assembly.

A torque tool can be useful to ensure you apply max torque without damaging hardware.