Purge Temperature Recommendation for changing PLA to ColorFabb

[William Ha @williamha My Robox is a Blue Commercial Version Hong Kong]

I am using a new head for the new XT reel (first time to try this). When attempting a purge, the brand new head states a last material temp of 195 degC. and the current material temp as 240 degC. The suggested purge temp is 217 degC.

Should I accept this suggestion? When fishing around in the forum, there seems to be an optimum value that I should set instead?

thx.

PS: I am new to robox and generally quite new to 3D printing. Perhaps this question has been asked somewhere in the forum but I can’t find anything via the search. (BTW, the search here seems a bit hard to use.)

[Pete @pete My Robox is a Blue Commercial Version CEL HQ Bristol UK]

230°C is probably the highest temp which is safe for PLA. If it sits at this temperature for long periods it will degrade and burn in the nozzles so just for purging.

I often use ABS in between other materials as it can take a large temperature range and still flow without degrading.

 

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[BHudson @bhudson I have several Robox units Kickstarter and Commercial Arizona, USA]

@williamha I use XT all the time and I use 230 to 235 for the transition between PLA and XT. As long as it is just a purge, you should be fine. Just don’t leave the print head at this temperature with PLA loaded. Keep watch on your printer and make sure it doesn’t sit for more than a minute or two at that temperature.

I operate two Betas and one Production Robox.
I am the US/Canada Technical Support engineer for the Robox.
See my 3D Hub site at https://www.3dhubs.com/phoenix/hubs/ben

[William Ha @williamha My Robox is a Blue Commercial Version Hong Kong]

Thank you all. I set the purge temperature at 230 degC and the process completed without incident.

[William Ha @williamha My Robox is a Blue Commercial Version Hong Kong]

One clarification: 230 degC going between XT and PLA meaning that I can use same purge temperature in going from XT to PLA?

And btw, the first print job using XT smelled a bit; but subsequent ones smells nothing. Why is it so?

 

[Pete @pete My Robox is a Blue Commercial Version CEL HQ Bristol UK]

The smell would probably have been PLA burning.

Yes use that temp to go XT to PLA as well.

The temperature needs to be enough to melt both materials without burning either. For this reason, in cases where there is extreme differences in recommended temperatures, it is sometimes best to put a different material through the nozzles which can melt safely at a temperature somewhere in between. This intermediate material can then flush the nozzles ready for another purge at a temp more suited to the new material.

For official support please visit www.cel-robox.com/support/ and create a ticket

[click @click My Robox is a Green Kickstarter Limited Edition]

@pete “…it is sometimes best to put a different material through the nozzles which can melt safely at a temperature somewhere in between…”

Maybe you should put this sentence somewhere in the user manual (under FAQ).

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