Trying out popular raft settings - Warning Message  

RE: Trying out popular raft settings - Warning Message

Save the project as a 3mf file (Prusaslicer/File menu), compress it, then upload the zip file here. This way we can see the STL and your settings. In general, there shouldn't be a need for a raft. 

Sorry, I can't read that.  Please post it here.

Cheerio,

RE: Trying out popular raft settings - Warning Message

Attached is the project file.  This is a handle for my screen door.  I could be wrong in my thinking, but the reason I'm printing the file out this way is so when the handle is used, the force is applied against the grain of the layers instead of with the grain.  I hope I've got that right.  I thought there would be less chance of a break.  I did try printing with a 5mm brim and the part dislodged right before the last layer.

RE: Trying out popular raft settings - Warning Message

Will do and thanks for looking.

RE: Trying out popular raft settings - Warning Message

The error message suggests you repair the model, did you try that?

RE: Trying out popular raft settings - Warning Message

It goes away if I remove the raft, so I think the raft is causing it.  The raft setting are causing a gap between 1.10 and 1.55.  This may be ok, but I just don't know.

RE: Trying out popular raft settings - Warning Message

Posted by: @kageryu

Attached is the project file.  This is a handle for my screen door.  I could be wrong in my thinking, but the reason I'm printing the file out this way is so when the handle is used, the force is applied against the grain of the layers instead of with the grain.  I hope I've got that right.  I thought there would be less chance of a break.  I did try printing with a 5mm brim and the part dislodged right before the last layer.

I'm not sure the attachment made it.  I'm going to try again

RE: Trying out popular raft settings - Warning Message

I tried printing out the handle again by increasing the brim to 10mm, but it dislodged from the build plate around 75%.  I'm wondering if I should slow down my infill speed or turn on "Lift Z".  This is assuming I can't get the raft to work.  My last resort would be to change the orientation of the print.

RE: Trying out popular raft settings - Warning Message

I see no reason why this model would dislodge with a large rim. The L shape should provide enough stability. I'd wash the sheet thoroughly with hot water and dish washing soap, and then wipe it with IPA before the print. Certainly no need for a raft.

RE: Trying out popular raft settings - Warning Message

Posted by: @fuchsr

I see no reason why this model would dislodge with a large rim. The L shape should provide enough stability. I'd wash the sheet thoroughly with hot water and dish washing soap, and then wipe it with IPA before the print. Certainly no need for a raft.

 

I do wash my plate and use IPA before every print.  I've noticed a good amount of vibration in the print the taller it gets.  It's failed twice.  Once with a 5mm brim and once with a 10 mm brim.  I might try slowing down the infill speed to see if that helps.

Your orientation is sensible.  Ensure the end of the part is flush with the build plate - use the 'Place on face' button.

No need for a raft, use a brim.

Clean the sheet with dishwashing detergent (Dawn/Fairy) and plenty of HOT water, rinse well and dry with a fresh paper towel. Handle by the edges only.

Suggested print-sheet cleaning regime:

Clean with IPA between prints.

At the first hint of a problem, use dishwashing detergent and HOT water.

If that's not enough use acetone: once or twice a year at most.

Cheerio,

RE:

Thanks to everyone for their advice.  I will try to print out again with just brim, but I'm going to double check my first layer and Extrusion Multiplier.  I realized after doing so research that the start g-codes I borrowed from Bobstro's project notes a few days back changed the extrusion multiplier.  His g-codes are great, but I should have read everything about them because it looks like it sets your extrusion multiplier at 100% (M221 S100 ; reset extrusion rate) where the default Prusa start codes sets it at 95% (M221 S{if layer_height<0.075}100{else}95{endif}).  Bob has done such a great job publishing his notes, you think a yo-yo like me would read every word.

I also did the nylock mod to see if I could get my bed really level about 2 weeks ago.  It worked, I got the bed variance within .02, but I don't think it helped anything.  When I printed out the Prusa bed level test, my right side was still really bad and seemed too close to the nozzle.  This is after getting the bed variance within .02.  I think having the bed with this mod was a little temperamental, at least for me as the results seemed to degrade over time.  So, last night, I removed it and went back to the stock bed without the nylock nuts and washers.  I'm not sure if this was adding to my issues or not, but it's gone now.

went back to the stock bed without the nylock nuts and washers

Sensible.

Too many impatient people dive into modifications in a misguided attempt to fix elementary problems.  Better to get the machine working properly for at least six months to discover what, if anything, needs to be changed to fit your particular needs.

Cheerio,

RE: Trying out popular raft settings - Warning Message

Posted by: @diem

went back to the stock bed without the nylock nuts and washers

Sensible.

Too many impatient people dive into modifications in a misguided attempt to fix elementary problems.  Better to get the machine working properly for at least six months to discover what, if anything, needs to be changed to fit your particular needs.

Cheerio,

Sage advice, disregard at your peril.

RE: Trying out popular raft settings - Warning Message

Couldn't agree more. Most of these "upgrades" are unnecessary at best, and detrimental or dangerous at worst.  

RE: Trying out popular raft settings - Warning Message

I've never got the point of a raft, why not use brim?

RE: Trying out popular raft settings - Warning Message

For me rafts go back to the days before mesh bed leveling, as a way to compensate for uneven print surfaces. These days I have a hard time seeing a scenario in which a brim wouldn't do the job. 

RE: Trying out popular raft settings - Warning Message

Posted by: @fuchsr

For me rafts go back to the days before mesh bed leveling, as a way to compensate for uneven print surfaces. These days I have a hard time seeing a scenario in which a brim wouldn't do the job. 

This! A thousand times this! The main reason rafts were used was because getting good bed adhesion was difficult, and a thick raft helped create a flat surface on a badly warped bed. I wouldn't bother with rafts after having paid for a removable PEI sheet.

RE: Trying out popular raft settings - Warning Message

I can count the number of times I've used a raft on the Prusa on one hand with multiple fingers left over!

Only semi-recent time was for an array of registration pegs printed vertically and needed a bit more support than the brim.