Wow Mr Prusa, I'm sorry I made you sad. :) Maybe I can make you feel better by telling you that your printer is great!
Firstly the melted heated bed connector. I don't feel entitled to come back to you directly because I have changed the bed to an aluminium one (and have had issues getting it up to ABS temperatures - can only get it to about 102 deg so far). I also don't consider my setup regular because the room temperature varies wildly and the air is foten dusty. I had been meaning to sort out a fan for the vertically-mounted electronics and a new enclosure to keep the dust out but I got distracted printing pretty vases. :| As for the aluminium bed, I am thinking about getting an SSR and a 24v supply but it seems like overkill. Maybe making an enclosure? I'm in no rush to decide.
You won't find any posts on your forum from me, I haven't yet decided on what to do about the Mini-Rambo. Let me get this straight - I am not disappointed or complaining. Money aside, I love issues like this because I learn a lot. I was going to buy a RAMPS anyway because no matter how nice the RAMBO is, I'm a long-time Arduino fan and the RAMPS feels more maker-y, less consumer. And I intend to build a machine next year. Ideally, I'd have liked a proper RAMPS board but I wanted it today. I like official stuff where possible, hence getting your printer.
However, I have to disagree with your assertion that the stepper, cable or connector is at fault. I don't see how swapping the X & Y connectors on the Rambo would transfer the fault to the other axis. i.e. both X & Y steppers acted in the same way when driven by the Y axis A4988. I'd love to think it was fine but I just can't see how it could be. Either way, I have had 3 weeks great printing out of it so it was not a shipping fault and it arrived here in working order. I'm not looking to blame anyone but if I had to point fingers, I guess it would be at the A4988 manufacturer or the PCB assemblers.
I just want to get printing again as soon as possible. I'm about to delve into the steps per mm config for the RAMPS setup and intend to use your calculator (I haven't had a reason to yet). Sorry to make you sad Jo, please cheer up! For the record, the RAMPS is made by 'big-tree-tech.com'. I know nothing about these guys but I just hope the board works OK. I'll find out in the next few hours!
Thanks to all (and a pleasure to get such high profile assistance, I'm loving this community and that's rare for me).
John
P.S. I apologise if my posts questioned your printer's cooling. As my earlier post states, the vertical mounting combined with dc42's info about the thermal vias and dissipation put my mind at rest on that front. Another reason why you haven't heard from me on your site, I don't consider it your fault.
Firstly the melted heated bed connector. I don't feel entitled to come back to you directly because I have changed the bed to an aluminium one (and have had issues getting it up to ABS temperatures - can only get it to about 102 deg so far). I also don't consider my setup regular because the room temperature varies wildly and the air is foten dusty. I had been meaning to sort out a fan for the vertically-mounted electronics and a new enclosure to keep the dust out but I got distracted printing pretty vases. :| As for the aluminium bed, I am thinking about getting an SSR and a 24v supply but it seems like overkill. Maybe making an enclosure? I'm in no rush to decide.
You won't find any posts on your forum from me, I haven't yet decided on what to do about the Mini-Rambo. Let me get this straight - I am not disappointed or complaining. Money aside, I love issues like this because I learn a lot. I was going to buy a RAMPS anyway because no matter how nice the RAMBO is, I'm a long-time Arduino fan and the RAMPS feels more maker-y, less consumer. And I intend to build a machine next year. Ideally, I'd have liked a proper RAMPS board but I wanted it today. I like official stuff where possible, hence getting your printer.
However, I have to disagree with your assertion that the stepper, cable or connector is at fault. I don't see how swapping the X & Y connectors on the Rambo would transfer the fault to the other axis. i.e. both X & Y steppers acted in the same way when driven by the Y axis A4988. I'd love to think it was fine but I just can't see how it could be. Either way, I have had 3 weeks great printing out of it so it was not a shipping fault and it arrived here in working order. I'm not looking to blame anyone but if I had to point fingers, I guess it would be at the A4988 manufacturer or the PCB assemblers.
I just want to get printing again as soon as possible. I'm about to delve into the steps per mm config for the RAMPS setup and intend to use your calculator (I haven't had a reason to yet). Sorry to make you sad Jo, please cheer up! For the record, the RAMPS is made by 'big-tree-tech.com'. I know nothing about these guys but I just hope the board works OK. I'll find out in the next few hours!
Thanks to all (and a pleasure to get such high profile assistance, I'm loving this community and that's rare for me).
John
P.S. I apologise if my posts questioned your printer's cooling. As my earlier post states, the vertical mounting combined with dc42's info about the thermal vias and dissipation put my mind at rest on that front. Another reason why you haven't heard from me on your site, I don't consider it your fault.