Callamon, the answer is 'with extreme difficulty and not without breaking things'. Snip the sprues in the middle with cutters and very carefully score around the joints to the real part with a sharp Xacto or similar, then you should be able to lever them till they snap at the right spot. The stuff is just so fragile, but I can't get it to print without the sprues for those spikes. I broke mine too in a couple of places.
Psimon, it is not looking good. Since my last post I have received two more 'problem notices' for parts in my December 22 order; making for four parts rejected. The rest show as printed now, even ones which were included in some of the rejection notices previously. It's beyond frustrating and beyond confusing.
Most of the problem parts appear to be breaking in ways they've never broken before, at points which are not natural weak spots and have printed fine in almost-identical iterations. I even received a "returning this part to 'first to try' status" alert for parts which have printed fine several times, without changes! Because a customer's order couldn't be printed properly. WHY NOT?!?
I really have to wonder whether this involves problems on the post-print cleaning side of things i.e.staff training issues. Not good, whatever the case. It does appear things have changed for the worse.
For now I am going to put the project on hiatus again until what's left of the new order finally arrives. I can't build a complete model with what I have so far; I still have no Fuel Module A sections and though the mid-spine top and bottom sections print fine, the fore upper and aft lower sections won't. This is baffling - if it was just a length issue, then why are the aft upper and fore lower sections OK!? The older ones were fine, so...
I'll start designing and ordering again after receiving the order and making sure what's actually sent is OK. They must hate me over there! But it is a bit grueling on my side of things too...