Are 3d Printed miniatures allowed?

3d printed miniatures are allowed, however only units which have been officially released by GW by the time of the event can be used on the day. Alternative models must be of similar size and be on round bases of similar size to the official bases. Aeronautica hex bases for fliers are the exception

Latest FAQ' can be found here at the time of publishing. All FAQs published by Games Workshop are in effect: https://www.warhammer-community.com/legions-imperialis-downloads/

What House Rules are in effect?

Forces which are primarily Space Marine Legions can take a maximum of 2 Legion Abilities in their force organisation. A 3rd Legion special rule can be selected however this must be taken as an Ally and included as part of the 30% Ally limitation. Any additional house rules will be in the event pack.