Replace your RAMPS fuses


Following on from Double the volts… double the fun! here is a nice little tip that I came across to avoid your 3D printer going up in flames…

Replace both polyfuses (PTC) (F1 and F2) in a RAMPS 1.4 board with car blade fuses 5A and 10 or 15 A respectively. The polyfuses, F1 (MF-R1100) is rated to 11 A 16 V, F2 (MF-R500) is rated to 5A 30 V

It should be noted that in subsequent versions of the RAMPS boards (1.5 and thereafter), the fuses are SMD (and may also require replacing).

See also




From this reply to 24V with Ramps 1.4 questions (which was based on LazyMonk’s suggestion, 1 and 2)

Put an inline metal blade fuse directly inbetween the PSU and Ramps (+) input

Note, that while they state that they are using blade fuses, they are not. This is a car blade fuse

12 volt car blade fuse and fuse holder
12 volt car blade fuse and fuse holder

From Auto Car 12V In-line Mini Blade Fuse Holder With 5 10 15 20 25 30A Fuses, £0.99

RAMPS 1.4.2

The use of car blade fuses is employed in the RAMPS 1.4.2 board

RAMPS 1.4.2

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