The model of the coils of the 250 type of garrett and 290 is round. The source is only on the coil of 290. Before filling it, it is desirable to reinforce the coil knitting needles on 290 at least with bamboo sticks. There is also a model of the ears for the bar, with the source. Printing Petg coils with plastic with 100% filling. The soup to the coil is glued with dichloroethane, well smear the surfaces and with a slight effort we press for a few seconds.