[Solved] Print Fan Error Intermittent  

Print Fan Error Intermittent

INTERMITTENT FAN ERROR

OCCURS WHEN LOTS OF SHORT FAST PRINT MOVEMENTS

FAN SEEMS NOISY

CAUSE: LOOSE FAN SCREW (short screw present – replace with correct 20mm screw)

I had the fan error so today I looked carefully.  The symptom was that when I printed normal benchy  and a few simple small parts it worked OK.  But when I tried to print the Printables  ( https://www.printables.com/model/1363728-prehistoric-benchy) benchy with supports, I got a fan error after 1 or two layers.  Also it seemed  a bit more noisy than usual.

Answer!

I found that the print fan seemed loose.  Lots of short erratic movements was shaking the fan more and causing the error.  On some prints there was much smoother printing without sudden accelerations.

I removed the screws and I could see that I had a 17.5 mm screw in the RHS so this could not tighten.  Also, the LHS, with the correct 20 mm screw, had worked a bit loose.  This must have been the last straw.

I noted that there is a warning about the screw length in the assembly manual on pages 72 and 73 “STEP 39 Print Fan Parts Preparation”.  I noted that the STEP 38 is insertion of a captured nut for the LHS screw.  The RHS nut is inserted after the part assembly and is grabbed by the 20 mm screw.  Short screw might not grab it.

Barry