Like any good maker, I like to buy the cheapest version of something that I can. If buying from two sources gets me something a few £s cheaper then thats what I’ll do.

What did I order?

I ordered an SKR v1.4 turbo (which has a 120Mhz processor compared to the standard 100Mhz processor) and 5 x Fysetc TMC2209 v3. Buying this combination saved me around £5, which in my eyes was worth it.

Whats the problem?

What I didn’t realise is that Fysetc had changed the pinout of the TMC2209 v3 from the earlier versions. This means that the jumper settings detailed on the SKR v1.4 page on aliexpress do not work. This results in a TMC connection error in Marlin and the inability to set the steps, current or use sensorless homing (which is a gimmick I know).

So what now?

Luckily I was able to find a fix for the issue. Even better is that no soldering or modification of the driver is required.

All that’s needed is to add the jumpers as shown (look for the green box) underneath each driver

No more TMC connection errors.