Need help fixing this Z scar

http://ift.tt/239SGRJ quite sure what’s going on here, but it’s clear that it has to do with the layer changes. Here’s some settings:Taz5 .5 mm nozzle.35 layer height, 2.85mm black lulzbot ABS235 C extruder, 110 C bed with hairspray70/70 inside/outside perimeter speed,150 travel30 bridge speed70 infill with 45mm/s top solid infill, 25% hexagon45 degrees starting angle, .15mm overlapexternal perimeters first, avoid crossing perimeters, retract when changing islands, and wipe after retract are all on.retractions settings are: 2mm length on move, 25 mm/s, 1mm z lift, .2mm extra on restart, .75 minimum travelshould I change the extra retraction on restart to a negative? http://ift.tt/1Uc7OgU

Cubex Uno/duo/trio conversion to open source, Need some advice/tips

I’m pretty much tired of my cubex’s proprietary software, it’s hands down the worst i’ve ever used/witness. I was wondering if anyone on this sub had actually done the conversion first hand. Currently looking for a nice board to convert to open source. I was considering the gt2560, which is a clone of the ardunio + ramps 1.4 but i haven’t found much info on it other than geeetech’s technical page. Any and all info is welcome. http://ift.tt/1UueZzs

Overhang support issue & skipping layers? :(

Hey everyone.I’m using a Printrbot Play with Cura. I’m running into two main problems right now.First of all, I noticed that using supports are nearly useless for any model I choose because the supports don’t actually touch the object itself. As a result, I’m getting absolutely terrible prints when there is an overhang.I thought that supports are supposed to be extremely close or actually touching the object so that the extruded filament can be placed on top of the support to continue building the object at very steep angles.Secondly, I am running into the issue where the object has multiple gaps and skipped layers. The object looks fine in Cura, but ends up having several gaps when printing. I cleaned the nozzle, printed slower and faster, enclosed the printer in a box, messed with cooling, but nothing seems to get rid of them.I believe the issue is with the filament itself because I am nearing the end of the spool and I read somewhere that it has a lot of friction involved with filament at the end of the spool. I believe this did not happen when the spool was full, but I am not 100% sure.Pictures: http://ift.tt/261EU5r http://ift.tt/1sFRxog