# RAMPS 1.4, 1.5 or 1.6?

I'm about to build a Prusa i3 dolly. I am confused whether to use RAMPS 1.4 or 1.5 or 1.6.

What is the big difference? Is it only the MOSFETs and the poly-fuses? If that is the case, would it be advisable to upgrade a RAMPS 1.4 board (replacing the MOSFETs, connectors, and fuses)?

• Looks like the 1.6 has a heatsink across the high current mosfets as well. Considering the cost difference is so negligible, I would just grab the 1.6. (Is all that time sourcing parts and resoldering worth saving less than $5?) – BrainSlugs83 Mar 8 '19 at 19:58 The drawback of RAMPS 1.5 and 1.6 are that they use SMD polyfuses which are a little more difficult to replace (for some people) than the large fuses from the RAMPS 1.4. However, the fuses of the RAMPS 1.4 are sticking out, then tend to bend once in a while when you work on the board and could therefore become prone to metal fatigue and break. Adding on top of this answer about cable wiring: For these type of connectors: please use ferrules on the cable ends for wires that transport high loads/currents and use screw terminals: For these type of connectors: please use y-type or fork connectors: • ... and use a proper crimping tool. Crimping with a$20 tool versus some random pliers you picked up is not only much faster, but it makes a night and day difference in the quality of your crimps, and they will be MUCH less prone to failure. (so far, I've never had a properly crimped connector fail). – BrainSlugs83 Mar 8 '19 at 19:55